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fix(mcp): InputSchema schema with empty properties for no-arg tools (#341)

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Signed-off-by: Marc Nuri <marc@marcnuri.com>
This commit is contained in:
Marc Nuri
2025-09-25 11:54:07 +02:00
committed by GitHub
parent 053fb2e31c
commit c69e90c70d
2 changed files with 28 additions and 0 deletions
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6
pkg/mcp/m3labs.go
View File

@@ -30,6 +30,12 @@ func ServerToolToM3LabsServerTool(s *Server, tools []api.ServerTool) ([]server.S
if err != nil {
return nil, fmt.Errorf("failed to marshal tool input schema for tool %s: %v", tool.Tool.Name, err)
}
// TODO: temporary fix to append an empty properties object (some client have trouble parsing a schema without properties)
// As opposed, Gemini had trouble for a while when properties was present but empty.
// https://github.com/containers/kubernetes-mcp-server/issues/340
if string(schema) == `{"type":"object"}` {
schema = []byte(`{"type":"object","properties":{}}`)
}
m3labTool.RawInputSchema = schema
}
m3labHandler := func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {

22
pkg/mcp/toolsets_test.go
View File

@@ -125,6 +125,28 @@ func (s *ToolsetsSuite) TestGranularToolsetsTools() {
}
}
func (s *ToolsetsSuite) TestInputSchemaEdgeCases() {
//https://github.com/containers/kubernetes-mcp-server/issues/340
s.Run("InputSchema for no-arg tool is object with empty properties", func() {
s.InitMcpClient()
tools, err := s.ListTools(s.T().Context(), mcp.ListToolsRequest{})
s.Run("ListTools returns tools", func() {
s.NotNil(tools, "Expected tools from ListTools")
s.NoError(err, "Expected no error from ListTools")
})
var namespacesList *mcp.Tool
for _, tool := range tools.Tools {
if tool.Name == "namespaces_list" {
namespacesList = &tool
break
}
}
s.Require().NotNil(namespacesList, "Expected namespaces_list from ListTools")
s.NotNil(namespacesList.InputSchema.Properties, "Expected namespaces_list.InputSchema.Properties not to be nil")
s.Empty(namespacesList.InputSchema.Properties, "Expected namespaces_list.InputSchema.Properties to be empty")
})
}
func (s *ToolsetsSuite) InitMcpClient() {
var err error
s.mcpServer, err = NewServer(Configuration{StaticConfig: s.Cfg})